hack.rs

//! This module only exists to force rustc to actually link these libraries and avoid them getting
//! stripped later on. This way we can avoid the `dlopen` that some of our dependencies seem to
//! love so much.
//! This is also in part needed because `--as-needed` is hardcoded in rustc, c.f. https://github.com/rust-lang/rust/blob/7f3b3df9e2f2efe3434b4f6fc76462d2c8ad332f/src/librustc_target/spec/linux_base.rs#L7-L18

use paste;

macro_rules! link_hack {
    ($lib:expr, $symbol:ident) => {
        #[link(name = $lib)]
        extern "C" {
            // The function signature doesnt actually matter because we never call it.
            fn $symbol();
        }
        paste::item! {
            #[used]
            static [<$lib:upper _HACK>]: unsafe extern "C" fn() = $symbol;
        }
    };
}

link_hack!("X11", XOpenDisplay);
link_hack!("Xcursor", XcursorLibraryPath);
link_hack!("Xi", XSelectExtensionEvent);
link_hack!("Xrandr", XRRFindDisplay);
link_hack!("vulkan", loader_init_dispatch);
link_hack!("wayland-client", wl_display_connect);